Cecile Richards, president of Planned Parenthood, sent a Mother’s Day greeting via Twitter on Sunday.

Richards’ tweet came as a recent study found that abortion is the most consequential issue determining the socioeconomic and demographic composition of the United States.

Professor James Studnicki and his colleagues at the University of North Carolina found that induced abortions account for more years of potential life lost than all other causes of death combined, and the black abortion rate and rate of years of life lost to abortion are more than three times that of whites.